Measurement uncertainty in broadband radiofrequency radiation level measurements

For the evaluation of measurement uncertainty in the measurement of broadband radio frequency radiation, in this paper we propose a new approach based on the experience of the authors of the paper with measurements of radiofrequency electric field levels conducted in residential areas of Belgrade and over 35 municipalities in Serbia. The main objective of the paper is to present practical solutions in the evaluation of broadband measurement uncertainty for the in-situ RF radiation levels. [Projekat Ministarstva nauke Republike Srbije, br. III43009

Comparison of experimental and simulated responses of TL and OSL dosimeters in poly-energetic and multi-directional photon radiation fields

The aim of this paper is to examine the energy and angular responses of thermoluminescent (LiF:Mg,Ti and LiF:Mg,Cu,P) and optically stimulated luminescent (Al2O3:C) dosimeters with experimental measurements and Monte Carlo simulations. Nine radiation qualities, with mean energies ranging from 33 keV to 1.25 MeV, and five angles of incidence, between 0° and 80°, were used to conduct this analysis. The IEC 62387:2020 international radiation protection standard was used as the dosimeter response measure of quality. The experimental and simulated data exhibit that the dosimeter responses meet the standard's criteria, with certain exceptions on lower energies

Comparison of the Angular Response of Thermoluminescent and Optically Stimulated Luminescent Personal Dosimeters

Determination of the angular dependence of thermoluminescent (TL) and optically stimulated luminescent (OSL) dosimeters is of great importance for their application in poly-energetic multidirectional photon radiation fields. In order to determine the angular dependence of the dosimeter responses for different photon energies, the dosimeters were mounted on an ISO water slab phantom, irradiated in two narrow beam X-ray qualities (N-40 and N-80) and in one gamma ray quality (S-Cs), defined in IAEA SRS 16. The angles of incidence ranged from 0° to 60°, with an increment of 20°. Two types of TL dosimeters were used: MTS-N (LiF:Mg,Ti) and MCP-N (LiF:Mg,Cu,P) and one type of OSL dosimeters, InLight (Al2O3:C). The two types of TL dosimeters have shown a similar deviation from their 0° responses for all the used radiation qualities, while the OSL dosimeters have shown a greater deviation from the reference values for the gamma radiation quality

Low-energy X-ray Angular Response of Optically Stimulated Luminescent Dosimeters

Following the requirements of radiation protection international standards, passive dosimetry systems are type tested, which includes the angular dependence. As it represents one of the most important dosimeter characteristics, the angular dependence of commercially available optically stimulated luminescent dosimeters has been examined in this paper. The empirically determined air kerma to the personal dose equivalent conversion coefficients decrease as the angle of incidence increases. It was anticipated that the dosimeter response would show a similar behavior. This expectation has been confirmed for all the used angles of incidence and energies of the primary X-ray beam, except for the 80° angle of incidence and the 33 keV and 48 keV mean photon energies, where an increase in the angular response has been observed

Comparison of the Energy and Angular Responses of Thermoluminescent and Electronic Personal Dosimeters

Determination of the response of thermoluminescent and electronic personal dosimeters as a function of photon energy and angle of incidence has a crucial impact on their application in poly-energetic multidirectional photon radiation fields. In the experimental part of this paper, in order to determine the energy dependence of the dosimeter responses, the dosimeters were mounted on an ISO slab phantom, irradiated in X and gamma ray fields, defined in the IAEA SRS 16, within the energy range of 33 keV - 1,25 MeV. Tested dosimeters have not shown an adequate response in the low photon energies relative to their Cs-137 responses, while in the middle and high energy photon ranges they performed well and have shown a deviation relative to their Cs-137 responses up to ±20%. In order to determine the angular dependence of the dosimeters the N-200 narrow beam radiation quality has been used. The angles of incidence for which the dosimeters were tested range from 0° to 80°, with an increment of 20°. Most of the dosimeters have behaved as expected, except for certain dosimeters due to their significant increase in response caused by the influence of the scattered radiation

Radiological survey of industrial building - a former facility for the production of phosphoric acid "Elixir Zorka - mineralna đubriva doo Šabac"

U procesu dobijanja fosforne kiseline, tehnološkim postupkom povećava se prisustvo prirodne radioaktivnosti, stoga nekadašnji pogon za proizvodnju fosforne kiseline predstavlja takozvano „istorijsko zagađenje”, i kao takav predstavlja potencijalnu opasnost u smislu nepotrebnog izlaganja zračenju. U okviru poslova dekontaminacije starog pogona izvršena je radiološka karakterizacija postrojenja pre, tokom i nakon postupka dekontaminacije, koja je podrazumevala uklanjanja samo nevezane kontaminacije sa svih površina i predmeta koji se nalaze u postrojenju. Radiološka karakterizacije predstvalja osnov za određivanje adekvatnog načina dekontaminacije, kao i za proveru njene efikasnosti. U radu su prikazani rezultati nivoa radioaktivne kontaminacije površina i merenja jačine ambijentalnog ekvivalenta doze gama zračenja na 15 cm od podloge.In the process of the production of phosphoric acid, a technological process increases the presence of natural radioactivity, therefore, the former plant for the production of phosphoric acid, presents the so-called "historical pollution", and as such represents a potential threat in terms of unnecessary exposure to radiation. In the framework of the decontamination of the old plan, radiological characterization of the plant was carried out before, during and after the decontamination process, which involved the removal of a non-fixed contamination on all surfaces and objects that have been found in the plant. Radiological characterization present the good base for determining of adequate ways of decontamination, as well as to verify its effectiveness. The paper presents the results of the level of radioactive contamination of the surface and measurements of the intensity of ambient dose equivalent at 15 cm from the surfaces.Зборник радова : XXIX симпозијум ДЗЗСЦГ : Сребрно језеро, 27-29. септембар 2017. годин

Response of TL and OSL passive personal dosimetry systems in poly-energetic and multi-directional photon radiation fields

The aim of this paper is to examine the energy and angular responses of thermoluminescent dosimeters containing either MTS-N (LiF:Mg,Ti) or MCP-N (LiF:Mg,Cu,P) detector materials, and of the InLight optically stimulated luminescent dosimeters containing Al2O3:C detectors. Ten radiation qualities, with mean energies ranging from 24 keV to 1.25 MeV, and five angles of incidence, between 0° and 80°, were used for this purpose. The dosimeter response measure of quality were the IEC 62387 requirements. The experimental results show that the MTS-N-based and the InLight dosimeters performed in line with the standard's criteria. On the other hand, the MCP-N-based dosimeters exhibited a pronounced under-response around the energy of 120 keV, which resulted in deviations from the standard's conditions for both the energy and angular responses. © 2019 Elsevier Lt

Application of an electronegative gas as a third component of the working gas in the Geiger-Mueller counter

In this paper, the application of three-component gas mixtures as a working gas in Geiger-Mueller tubes was considered. In addition to the noble and quenching gas, an electronegative gas is used, at the same time, as the third component of gas mixture. This paper is mostly experimental. The experiments are carried out on the enlarged Geiger-Mueller counter tube model. By applying the similarity law for electric discharges in gases on the model and commercial Geiger-Mueller counting tubes, the model was verified. The obtained results showed that a small percentage of SF6 gas, in the working gas, stabilize operating point of Geiger-Mueller counter tubes and reduce dead time. This article has been corrected. Link to the correction 10.2298/NTRP1804417E</font

Lifetime characteristics of Gaiger-Muller counters

This paper discusses the process of functional aging of Geiger-Muller counters. Two types of Geiger-Muller counter chambers were characterized in an experiment using a combined constant voltage. Chamber A had a coaxial geometry and chamber B had a plan-parallel geometry. The experimental results indicate that the aging process was faster in the case of chambers with a coaxial geometry. The results are explained based on the process of electrical discharges in gasses